Construction method of attic floor

1, according to the calculation of different spans, static loads and dynamic loads of buildings, choose reasonable profiles and design the spacing between the main beam and the secondary beam, so as to better and more reasonably select fiber cement pressure plates.

2. During the construction of fiber cement pressure plate, the arrangement and welding of profiles must meet the design requirements of drawings, and the weld strength and welding quality must meet the standard requirements of GB/T5 185- 1985. The weld on the contact surface of fiber cement board should be smoothed before paving, so as to remove spatter during welding.

3. According to the span of the building, the size of the load and the spacing of the supporting beams, the thickness of the fiber cement board is different. However, according to the national building materials specification, the fiber cement board selected must be a high-density fiber cement board with a density greater than 1.8g/cm3 and a flexural strength (air drying) greater than 28Mpa.

4. The longitudinal resistance and transverse resistance of high-density fiber cement board are slightly different, so the longitudinal direction of the board should be placed parallel to the main beam, and the edges of the joints between the boards should fall on the same beam, and the joints between the boards should be filled and sealed with silicone adhesive.

5. Any edge of the fiber cement board shall not be suspended.

6. The length of the self-tapping nail for fixing is 30-35 mm of the thickness of the steel plate, the nail distance is between 300-600mm, and the center of the nail hole around the steel plate should be about 20mm away from the edge of the steel plate.

7. Considering the waterproof layer in the kitchen and bathroom, the area is small, and the static and dynamic load requirements are slightly smaller, so the thickness of the plate can be slightly thinner, and the model of the selected profile can also be judged accordingly.